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  <div id="layout-content"><div id="function.ftp-alloc" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ftp_alloc</h1>
  <p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">ftp_alloc</span> &mdash; <span class="dc-title">为要上传的文件分配空间</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.ftp-alloc-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>ftp_alloc</strong></span>(<span class="methodparam"><span class="type">resource</span> <code class="parameter">$ftp_stream</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$filesize</code></span>, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$result</code><span class="initializer"> = ?</span></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   向远程 FTP 服务器发送 <code class="literal">ALLO</code> 命令，
   来为要上传的文件分配空间。
  </p>
  <blockquote class="note"><p><strong class="note">注意</strong>: 
   <p class="para">
    很多 FTP 服务器不支持<code class="literal">ALLO</code> 命令。
    如果服务器不支持此命令，将会返回错误码（<strong><code>false</code></strong>），
    返回成功码（<strong><code>true</code></strong>）表示预分配空间不是必需的，
    客户端可以继续操作了。
    因此，请仅对需要强制预分配空间服务器使用此函数。
   </p>
  </p></blockquote>
  <p class="para">
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.ftp-alloc-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">ftp_stream</code></dt>

     <dd>

      <p class="para">
       FTP 连接标示符。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">filesize</code></dt>

     <dd>

      <p class="para">
       要分配的空间，以字节为单位。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">result</code></dt>

     <dd>

      <p class="para">
       如果提供此参数，那么服务器的响应
       会以文本方式设置到 <code class="parameter">result</code> 中。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.ftp-alloc-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.ftp-alloc-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4261">
    <p><strong>示例 #1 <span class="function"><strong>ftp_alloc()</strong></span> 函数例程</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"/home/user/myfile"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;连接服务器<br /></span><span style="color: #0000BB">$conn_id&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'ftp.example.com'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$login_result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">ftp_login</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'anonymous'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'user@example.com'</span><span style="color: #007700">);<br /><br />if&nbsp;(</span><span style="color: #0000BB">ftp_alloc</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">filesize</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Space&nbsp;successfully&nbsp;allocated&nbsp;on&nbsp;server.&nbsp;&nbsp;Sending&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #DD0000">.\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;</span><span style="color: #0000BB">ftp_put</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'/incomming/myfile'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">FTP_BINARY</span><span style="color: #007700">);<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Unable&nbsp;to&nbsp;allocate&nbsp;space&nbsp;on&nbsp;server.&nbsp;&nbsp;Server&nbsp;said:&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">ftp_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_id</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.ftp-alloc-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.ftp-put.html" class="function" rel="rdfs-seeAlso">ftp_put()</a> - 上传文件到 FTP 服务器</span></li>
    <li class="member"><span class="function"><a href="function.ftp-fput.html" class="function" rel="rdfs-seeAlso">ftp_fput()</a> - 上传一个已经打开的文件到 FTP 服务器</span></li>
   </ul>
  </p>
 </div>

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